Now that I have my iPhone 4 pre-ordered, I need to get rid of my 3G. It is currently not unlocked (to my knowledge), but it is jailbroken. What steps should I take before listing my phone for sale on eBay to ensure none of my data is on the phone, and to get maximum value out of it? Is there any easy way to reset it to factory settings? Is there an easy way to unlock it (I'm assuming this will add value)? Thanks in advance.

well im just saying if you have the new baseband you cant unlock. id use what ever you used last time. also dont let itunes update and restore because you will get the new bas band that can not be unlocked. but if it can be just use ultra snow via cydia. but i found that you need to have the sim you want to unlock in the phone. good luck. and i will be joining every one for the iphone 4 party as well

go to settings and then general than about and scroll down. Im only saying if you can set it up for an unlock or have a baseband that can be unlocked you should. More money for you if you have an older 3g. but seeing the noob ness its prob not. GOOD LUCK CHEERS!